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A Dynamic Precision Evaluation Method for the Star Sensor in the Stellar-Inertial Navigation System.

Jiazhen Lu1, Chaohua Lei2, Yanqiang Yang2

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This study presents a new method for verifying star sensor accuracy using an inertial navigation system (INS). The dynamic precision verification method ensures the star sensor meets system requirements for reliable attitude measurement.

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Area of Science:

  • Aerospace Engineering
  • Navigation Systems
  • Optical Sensors

Background:

  • Stellar-inertial navigation systems combine inertial navigation systems (INS) and star sensors for high-precision attitude determination.
  • Validating the accuracy of star sensors is crucial for their practical application, especially under dynamic conditions.
  • Dynamic precision evaluation of star sensors is challenging due to real-time reference values and environmental factors.

Purpose of the Study:

  • To propose a novel dynamic precision verification method for star sensors.
  • To enable real-time attitude accuracy measurement by integrating star sensors with an inertial navigation device.
  • To establish criteria for evaluating star sensor performance in dynamic scenarios.

Main Methods:

  • Utilizing a star simulator to generate a gold-standard reference for dynamic evaluation.
  • Calculating altitude and azimuth angle errors of the star sensor as key evaluation metrics.
  • Employing a comparison with static accuracy measurements to mitigate sensor drift and device impacts.

Main Results:

  • The proposed method effectively verifies the dynamic precision of star sensors.
  • Experimental results demonstrate the feasibility and effectiveness of the dynamic verification approach.
  • The method confirms if dynamic performance matches static accuracy, indicating suitability for system specifications.

Conclusions:

  • The developed method provides a reliable way to assess star sensor accuracy in dynamic environments.
  • The integration of INS aids in achieving real-time attitude accuracy measurements.
  • The verification approach ensures the practical precision of star sensors meets demanding application requirements.